Juniper Networks Inc. (NYSE: JNPR) officials say they expect revenues to climb in the June quarter, despite a potential pause in spending from Japan. (See Juniper Reports Q1.)

In announcing earnings Tuesday, Juniper CFO Robyn Denholm predicted June-quarter revenues of US$1.13 billion to $1.18 billion, up from $1.102 billion for Juniper's first quarter, which ended March 31.

The numbers don't plan for the worst case, in which Japan's revenues would drop to zero, but Denholm says they do brace Juniper for a severe slowdown in Japan.

"In any one quarter, [Japan's] revenues vary between 5 and 8 percent of our total revenues. At the low end of the guidance, that percentage is far less than that," Denholm said.

Why this matters
With the earnings season in full swing, investors will be looking for signs of trouble out of Japan. So far, so good, mostly.

Alongside Juniper, Intel Corp. (Nasdaq: INTC) claimed during its earnings call on Wednesday that it wasn't seeing any detrimental effects on its supply chain. On the other hand, Texas Instruments Inc. (NYSE: TXN) reported on Monday that it saw demand drop in Japan during March.

Juniper mentioned no supply-chain problems caused by the quake. Then again, such problems would be more noticeable in other sectors, such as mobile devices; Sony Ericsson Mobile Communications CEO Bert Nordberg noted shortages in displays, batteries and some printed circuit boards in an interview with Reuters. Sony Ericsson hasn't seemed too badly affected by the quake so far, but Nordberg said in the interview that the supply-chain impact would be bigger in the next quarter.

There are plenty of other earnings announcements to go, including Apple Inc. (Nasdaq: AAPL) on Wednesday and Nokia Corp. (NYSE: NOK) on Thursday (European time), so investors have plenty more chances to worry about the Japan effect.

For more
Here's our coverage of the earthquake's aftermath.

• Sony Ericsson Stays Profitable Despite Quake
• Quake in Japan Rocks Cell Phone Image Sensors
• NTT Updates on Earthquake Impact
• Japan Update: NTT Discusses Network Recovery
• Japan Is Shouting at Operators – Will They Listen?
• Japan Efforts Continue, Impact Assessed
• Japan Strives to Restore Services
• Japan's Comms Still Hampered
• Quake Rattles Japan Telecom
• Apps Watch: Using Mobile to Connect to Japan
• Japan Quake Hits Mobile Access

— Craig Matsumoto, West Coast Editor, Light Reading